Well, if you're putting a BO with an Isa Brown, each chick will get 1/2 of the parent's DNA. So, each chick will be half BO and half Isa Brown. But, I "believe" Isa Browns are a mix of two different breeds, so you'd get a bird that is 1/2 BO, 1/4 Rhode Island White and 1/4 Rhode Island Red.